If you want to be 95% confident of estimating the population proportion to within a sampling error of+- 0.02 and there is historical evidence that the population proportion is app 0.40. what sample size is needed?

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Q8.37

If you want to be 95% confident of estimating the population proportion to within a sampling error of+- 0.02 and there is historical evidence that the population proportion is app 0.40. what sample size is needed?

 

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